8330475: Remove unused default value for ModRefBarrierSet::write_ref_array_pre

Reviewed-by: gli, tschatzl

Author: albertnetymk

src/hotspot/share/gc/shared/modRefBarrierSet.hpp

@@ -61,9 +61,9 @@ class ModRefBarrierSet: public BarrierSet {
 
   // Below length is the # array elements being written
   virtual void write_ref_array_pre(oop* dst, size_t length,
-                                   bool dest_uninitialized = false) {}
+                                   bool dest_uninitialized) {}
   virtual void write_ref_array_pre(narrowOop* dst, size_t length,
-                                   bool dest_uninitialized = false) {}
+                                   bool dest_uninitialized) {}
   // Below count is the # array elements being written, starting
   // at the address "start", which may not necessarily be HeapWord-aligned
   inline void write_ref_array(HeapWord* start, size_t count);